I'HE ACIDIMETIIV OF HVIMKXIEX FLUORIDE. 



265 



Table III. 



Streii.^'tli of liydrotiuorie acid ( aj by lime metliud, •24-98%'', H, j by .silica luotliod. 

 23"y8>, (c) by cak-iuiu tinoride method, 2511%; lueun of ('a j and Uj. 2oü2^. 



Of tlii.s solution from 1-488 to -7457 gnmis were taken foi- eacb detevininatioii, 

 i-e(juii-ini,f froni !)H-28 to 45-7(5 ct-.s. of twice-deeinornial alkali. 



Tit rat ion tritli Potassiiiin hi/dro.ciilc. 



1 u< lica tor. 



Rosoiic acid. 



Phenolphthalein, distinctly pin 



Colour wiieu 

 ueutriilised. 



distinctly i^'ed. 



Litmus. 



Brazil wood. 



Phenacetolin. 



Cochineal. 



Lacmoid. 



Turmeric paper. 



Ces- -^ alkali 



required by 



one giii'ii of 



solution. 



pure litmus blue 



violet. 



purpk 



violet. 



pure lacmoid blue. 



reddish brown. 



(■)|-i)() 



(ri-bO 

 G-2-32 



61-28 

 bl-54 



(31-80 

 (jl-7(i 



6-2-(J(3 

 (5 Ml» 



Ü2-Ö0 

 6l-4i) 



(jl-30 

 (31-li* 



61-88 

 62-01 



(■)2-().'3 



62-49 



6i-885 



61-7N 



61-925 



(•)2-i4.-) 



61-24:) 



61-92 



Per cent, of 

 acid found 

 instead of 



25-02. 



24-82 



25-00 



24-55 



24-71 



24-7- 



24-8(J 



-24-50 



•24-77 



